* {
  padding: 0;
  margin: 0;
}

@keyframes sub {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.main_bg {
  width: 400px;
  height: 600px;
  background: url(./images//background_1.png) no-repeat;
  background-size: cover;
  overflow: hidden;
  margin: 20px auto;
  position: relative;
}
.sub {
  width: 40px;
  animation: 1.5s sub linear infinite;
}

.big_plane {
  width: 60px;
}


.pannel {
  width: 100px;
  height: 120px;
  margin-left: 20px;
  padding-top: 20px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

.item {
  color: #fff;
  font-weight: 700;
  font-size: 20px;
  margin-bottom: 10px;
}

.game_over {
  color: #fff;
  font-weight: 700;
  font-size: 20px;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  background: rgba(0, 0, 0, 0.5);
}
.game_over span {
  line-height: 40px;
  cursor: pointer;
}
.game_over > span:hover {
  color: #ff6700;
}
